市販牛乳中의 有毒性 農藥의 殘留量에 關한 調査 硏究

姜漢吉 서울大學校 保健大學院 1971 公衆保健雜誌 Vol.8 No.1

A study was carried out to determine chlorinated pesticide residues in milk collected from three pasteurizing plants in Seoul July and in October, 1970, respectively. The pesticide residues was extracted from milk with mixed ether, and the extract was cleaned up on a Florisil column. The pesticide residues were determined by Gas Liquid Chromatography using electron capture detection. The method was sensitive to concentrations of 0.002mg/ml. The Gas Chromatographic detection yielded average recoveries from fortified milk of 97.3% at levels of 0.04ppm for the pesticide residues. The result of instrumental assay on chlorinated pesticide residues in milk were as follows. 1. Lindane, Aldrin, Heptachlor, and p,p'-DDT were not detected throughout whole milk samples on the basis of the GLC sensitivity. 2. Chromatograms of extract from Seoul Milk Plant show the three peaks which differ from retention times of above components. 3. Four components, Lindane, Aldrin, Heptachlor, and p,p'-DDT were not detected by TLC from whole milk samples, but one or two spots which have different Rf value were detected.

코스닥150 선물시장의 성장과 연계거래

강한길 단국대학교 미래산업연구소 2021 산업연구 Vol.45 No.3

I analyze the growth of the KOSDAQ150 futures market and possible cross-product trading on the futures, spot, and ETF markets. The KOSDAQ150 futures and ETF markets, which have not been quite active, have grown significantly in the sample period. Especially, domestic security firms, institutions, and foreigners’ trading amount have grown remarkably. The growth of trading activity is notable, compared to that in the KOSDAQ stock market which mainly consists of individual investors. From this observation, I measure the cross-product trading activities in the futures, spot, and ETF markets. Suggested four types of cross-product trading activities are spot/futures arbitrage, ETF creation and redemption, hedge of the ETF market makers, and ETF/futures arbitrage. I present the maximum amount of cross-product trading activities in the futures market. As a result, estimated cross-product trading activities contribute about 30% of the growth of the trading amount of the KOSDAQ market, which implies that the cross-product trading grows with the futures market. The empirical results suggest that the unique function of derivatives market such as risk management and price discovery are related to the growth of the overall market through the cross-product trading activities. Also, futures, spot, and ETF markets do not cannibalize each other and they can grow together by cross-product trading activities. 본 연구에서는 코스닥150 선물시장 거래대금의 성장과 선물, 주식, ETF 시장의 연계거래 행태에 대해 분석한다. 표본 기간 동안 기존에 크게 활성화되어 있지 않았던선물과 ETF 시장의 거래대금은 큰 폭으로 상승했으며, 특히 국내 증권사와 기관, 외국인의 거래활동이 크게 상승하였다. 이러한 거래활동의 증가는 개인투자자가 대부분을 차지하는 코스닥 주식시장에 비해 두드러지게 나타났다. 이에 기인하여 본 연구에서는 선물, 주식, ETF 시장 간 연계거래 활동을 측정한다. 연계거래의 4가지 종류로는 주식과 선물의 차익거래, ETF의 설정 및 환매, ETF 시장조성자의 헤지, ETF와선물 차익거래를 들었으며, 시장 참여자들이 연계거래를 최대한 활용했다고 가정했을 때의 선물 거래대금에 대한 영향을 제시한다. 결과적으로, 연계거래는 선물시장거래의 약 30%를 차지하며, 선물시장의 성장과 연계거래 규모가 함께 성장한 것을확인할 수 있다. 본 연구의 실증분석 결과는 연계거래를 통해 나타나는 파생상품 시장 고유의 기능인 위험관리와 가격발견 기능이 여러 시장의 성장과도 관련됨을 뜻한다. 또한, 선물, 주식, ETF 시장 중 특정 시장의 성장이 다른 시장의 성장을 억제하는 것이 아닌, 시장 간의 연계거래를 통해 동반 성장할 수 있다는 가능성을 시사한다.

메타버스 환경에서 청소년의 청각 경험에 대한 분류와 제안: 제페토, 마인크래프트, 로블록스를 중심으로

강한길,남궁기찬,박병우,반영환 대한인간공학회 2023 大韓人間工學會誌 Vol.42 No.2

Objective: The purpose of this study is to provide practical basic data for auditory design to improve the reality of metaverse platform services by classifying the auditory experience environment in metaverse space for metaverse platforms. Background: There are studies that prove that sound helps improve realism in virtual reality and studies that have designed soundscapes in the real world through various methods of sound classification. Method: By conducting a survey, the target metaverse platform is selected, and sound in the service is classified by applying sound identity classification and soundscape classification in previous studies. Results: During the sound activities of the sound identity classification, interaction sound and service sound were applied to the classification according to the instruction function of the soundscape classification to define a new classification method and classify the sounds of the metaverse service. Conclusion: The interaction sound was properly inserted, but it was found that the sound elements of the experience sound portion were insufficient. Application: It can be used as a practical basic data when developing metaverse services, and various follow-up studies can be made because new classification methods have been proposed in the sound field where many studies have not been conducted.

베트남 참전 제대 군인의 범주화된 에이전트 오렌지 개인 폭로량과 혈청 다이옥신 측정치와의 상관성에 관한 연구

강한길,임현술,정해관,임민경,김정순,Kang, Han-K.,Lim, Hyun-Sul,Cheong, Hae-Kwan,Lim, Min-Kyung,Kim, Joung-Soon 대한예방의학회 2001 예방의학회지 Vol.34 No.1

Objectives : In an epidemiologic study on the health impact of Agent Orange exposure, the valid estimation of exposure level is the most important step. Based on recent studies, we examined the correlation between exposure levels categorized by personal exposure estimates and serum 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD, Dioxin), exploring the possibility of utilizing the exposure level as a surrogate for the estimate of exposure to agent orange. Methods : During the study period (Jan 1996-Feb 1996), blood specimens of 745 subjects taken randomly among 1,329 persons and kept frozen, were analyzed for 2,3,7,8-TCDO and six other dioxin congeners. The serum dioxin and congeners were measured in 1998 by CDC, adjusted for serum lipids. We categorized the total exposure scores into five groups based on Agent Orange exposure data collected by interview and military records. Pearson and Spearman's correlation coefficients & multiple regression analysis were used to identify the relationship of the exposure level categorized with serum concentration of 2,3,7,8-TCDD, and six other dioxin congeners. Results : Dioxin and the other congeners, except 1,2,4,6,7,8-HpCDD, showed significant correlations to exposure categories (p<0.005): 2,3,7,8-TCDD and OCDD showed positive correlations, whereas the other congeners did negative. The values of 2,3,7,8-TCDD differed according to exposure category and proportionally increased from the low exposure group to the high, a dose-response relationship, even after other possible confounding variables were adjusted for. In multiple regression analysis, age$(\beta=0.033)$, dioxin$(\beta=0.433)$, 1,2,3,7,8-PeCDD$(\beta=-0.998)$, 1,2,3,4,7,8-HxCDD$(\beta=-0.773)$, 1,2,3,6,7,8-HxCDD$(\beta=0.255)$, 1,2,3,7,8,9-HxCDD$(\beta=-3.468)$, 1,2,3,4,6,7,8-HpCDD$(\beta=0.109)$ we re found to be significantly related to the total exposure score(p<0.005). Conclusion : This study demonstrated that the use of such categorizations as a surrogate measure of agent orange exposure in identifying exposure degrees in a health impact study is valid.

市販牛乳中의 有毒性 農藥의 殘留量에 關한 調査 硏究

姜漢吉(Han Kil Kang) 서울대학교 보건환경연구소 1971 보건학논집 Vol.8 No.1

거시경제변수를 이용한 한국 국채 초과수익률 분석

강한길 ( Hankil Kang ),이순희 ( Soonhee Lee ) 한국금융연구원 2019 금융연구 Vol.33 No.4

본 연구는 한국 국채시장에서 초과수익률을 결정하는 요인을 실증적으로 분석한다. 분석에는 Cochrane and Piazzesi(2005)의 선도금리요인과 거시경제변수를 사용하였다. 세부적으로 거시경제 변수는 현재 경제상황을 수치화해서 나타내는 통계자료와 미래 경제상황에 대한 서베이자료, 경제전문가의 경제전망자료를 포함한다. 실증분석 결과, 선도금리요인은 초과수익률에 대해 예측력을 가지지만 Cochrane and Piazzesi와 달리 채권초과수익률을 설명하는 단일요소는 아니며, 장기채권의 초과수익률에 대한 예측력이 단기채권 초과수익률에 비해 낮게 나타났다. 거시경제변수중에서는, 현재 경제상태를 나타내는 경제지표와 경제전문가의 경제전망지표는 초과수익률에 대한 예측력을 가지고 있지 않았으나, 소비자와 생산자가 미래 경제환경에 대해 가지는 예측정보를 포함하는 서베이자료는 중장기채권 초과수익률에 대해 유의한 설명력을 가지고 있었다. 따라서 한국국채시장의 초과수익률에 대한 정보는 이자율 곡선 내 상당히 포함되어 있으나, 이 외에도 이자율 곡선에 포함되어 있지 않으면서 초과수익률에 대한 예측력을 가지는 요소가 있음을 실증적으로 확인하였다. It is well-known that the excess returns of bonds are time-varying. However, it is in debate what factors determine excess returns. In this study, we examine the predictability for excess returns using the forward rates and macro-economic variables. In detail, we use bond spot rates and three different types of macro-economic variables that are statistics representing current economic conditions and survey data from business participants and professional economists representing future expected economic conditions. We conduct principal component analysis for each group of macro-economic variables, and a few principal components are used to examine whether the macro-economic variables have predictability for excess returns. The main findings of this study can be summarized as follows. First, the forward rate factor that can be obtained by a linear combination of forward rates representing the information on the yield curve has predictability for the excess returns. However, it is rejected that the forward rates are the only factor to explain excess returns and it means the information on the yield curve is not enough to explain future bond excess returns. Second, the macro-economic variables representing current economic conditions and survey data from economists have no predictability for bond excess returns. Third, the survey data from consumers and producers have predictability for long-term bond excess returns, different from the survey data from economists. Additionally, the survey data from consumers and producers have predictability for future real GDP growth. Based on these results, we conclude that excess returns can be predicted by not only the information reflected in the yield curve but also expectations for future market conditions.

인공지능 작곡 프로그램 활용에 대한 한계점과 사용성 개선에 관한연구

강한길(Hangil Kang),반영환(Younghwan Pan) 대한인간공학회 2022 대한인간공학회 학술대회논문집 Vol.2022 No.4

한국 채권 초과수익률 예측요인에 관한 연구

강장구,강한길,이순희,이은미 한국재무학회 2015 財務硏究 Vol.28 No.2

거시경제변수를 이용한한국 국채 초과수익률 분석

이순희,강한길 한국금융학회 2019 금융연구 Vol.33 No.4

It is well-known that the excess returns of bonds are time-varying. However, it is in debate what factors determine excess returns. In this study, we examine the predictability for excess returns using the forward rates and macro-economic variables. In detail, we use bond spot rates and three different types of macro-economic variables that are statistics representing current economic conditions and survey data from business participants and professional economists representing future expected economic conditions. We conduct principal component analysis for each group of macro-economic variables, and a few principal components are used to examine whether the macro-economic variables have predictability for excess returns. The main findings of this study can be summarized as follows. First, the forward rate factor that can be obtained by a linear combination of forward rates representing the information on the yield curve has predictability for the excess returns. However, it is rejected that the forward rates are the only factor to explain excess returns and it means the information on the yield curve is not enough to explain future bond excess returns. Second, the macro-economic variables representing current economic conditions and survey data from economists have no predictability for bond excess returns. Third, the survey data from consumers and producers have predictability for long-term bond excess returns, different from the survey data from economists. Additionally, the survey data from consumers and producers have predictability for future real GDP growth. Based on these results, we conclude that excess returns can be predicted by not only the information reflected in the yield curve but also expectations for future market conditions. 본 연구는 한국 국채시장에서 초과수익률을 결정하는 요인을 실증적으로 분석한다. 분석에는Cochrane and Piazzesi(2005)의 선도금리요인과 거시경제변수를 사용하였다. 세부적으로 거시경제변수는 현재 경제상황을 수치화해서 나타내는 통계자료와 미래 경제상황에 대한 서베이자료, 경제전문가의 경제전망자료를 포함한다. 실증분석 결과, 선도금리요인은 초과수익률에 대해예측력을 가지지만 Cochrane and Piazzesi와 달리 채권초과수익률을 설명하는 단일요소는 아니며, 장기채권의 초과수익률에 대한 예측력이 단기채권 초과수익률에 비해 낮게 나타났다. 거시경제변수중에서는, 현재 경제상태를 나타내는 경제지표와 경제전문가의 경제전망지표는 초과수익률에대한 예측력을 가지고 있지 않았으나, 소비자와 생산자가 미래 경제환경에 대해 가지는 예측정보를포함하는 서베이자료는 중장기채권 초과수익률에 대해 유의한 설명력을 가지고 있었다. 따라서한국국채시장의 초과수익률에 대한 정보는 이자율 곡선 내 상당히 포함되어 있으나, 이 외에도이자율 곡선에 포함되어 있지 않으면서 초과수익률에 대한 예측력을 가지는 요소가 있음을실증적으로 확인하였다.

대심도 복층터널에 대한 굴착 안정성 평가비교 연구

장남주,강한길,김기환,최창림 사단법인 한국터널지하공간학회 2019 한국터널지하공간학회논문집 Vol.21 No.1

'주요 도심지 도로건설은 포화상태로 지하공간의 개발이 필요하며 이를 위해 지하철도와 지하 도로 터널의 건설은 활발히 진행되어 왔다. 국외의 경우 지하 도로터널을 2층구조로 활용하는 복층터널 시공이 이루어 졌으며 이에 따른 지하공간 개발 기술이 높은 수준에 이르고 있다. 2차로 병설터널을 2차로 복층터널로 계획하는 경우 굴착 면적은 크게 차이가 나지 않으며, 터널 통과구간이 차지하는 폭을 대폭 줄일 수 있다. 이를 통해 터널 통과구간이 차지하는 폭을 대폭감소시킬 수 있으므로 지반조건이 불량한 경우 필요한 상부 보강 비용을 절감할 수 있다. 본 연구에서는 복층터널 굴착에따른 영향에 대해 알아봄으로써 지하공간 활용 기술을 높이고 단층터널 굴착영향과 비교를 통해 향후 복층터널 설계 및안정성 평가에 도움이 될 수 있을 것으로 기대된다. It is necessary to construct underground in the metropolis. Road traffic has reached saturation point. The city has several underground road construction projects. In abroad, double deck tunnels are planned and constructed. It is attained a high level of underground development technology. In case the double deck tunnel (2 lane) is planed instead of the bidirectional tunnel (2 lane), excavation area is similar. But tunnel width is decreased. The reduced width can cut cost for the tunnel reinforcement. This study evaluates the stability of excavation on double deck tunnel. By the assessment of the strength-stress ratio and strength reduction method, quantitative analysis is conducted between double deck tunnel and the bidirectional tunnel